[Backbone] First App: Modle, View of Backbone.js

var Appointment = Backbone.Model.extend({});
var appointment = new Appointment();
appointment.set('title', 'My knee hurts');
var AppointmentView = Backbone.View.extend({
  render: function(){
    $(this.el).html('<li>' + this.model.get('title') + '</li>');
  }
});
var appointmentView = new AppointmentView({model: appointment});
appointmentView.render();
$("#app").html(appointmentView.el);